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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954f2356614e1150405f09a141ecb0aedaa1d6cd8e11f0466d038763f609bc8b' 
  AND token = 'Y5Rp5myqUdsDaFRrIhPkEf2Y1aCvUHSYxO5csZ2/7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}